Mitsubishi 380. Manual - part 611

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-536

STEP 2. Using diagnostic tool , read the diagnostic trouble 
code (DTC).
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the MPI-DTC has been deleted, read the MPI-DTC 

again.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC U1120 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-537

DTC U1121: T/M  CAN Message

CAUTION

• Before replacing the ENGINE-ECU, make sure 

that the communication circuit is operating 
normally.

.

DTC SET CONDITIONS

Check Conditions

• None.

Judgement Criteria

• MIL activated after 2 drive cycles.

• Limp home - locked in 3rd gear and engine speed 

limted.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this code to be set are:)

• CAN line harness damage or connector damage.

• TCU or transmission

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

• : Diagnostic tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using diagnostic tool , diagnose CAN bus line.

CAUTION

To prevent damage to diagnostic tool , always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. Refer to GROUP 54C, Can 

Bus Diagnostics Table 

P.54C-15

. Then go to Step 6.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-538

STEP 2. Using diagnostic tool , read the diagnostic trouble 
code (DTC).
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the MPI-DTC has been deleted, read the MPI-DTC 

again.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC U1121 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-539

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with Diagnostic Tool Is Not Possible. (Comunication 
with All Systems Is Not Possible.)   

.

CIRCUIT OPERATION

• A battery positive voltage is applied on the data 

link connector power terminal (terminal No. 16). 
The ground terminals (terminal No. 4, No. 5) are 
grounded to the vehicle body.

.

COMMENT

• The cause is probably a defect in power supply 

system (including ground) for the on-board diag-
nostic test mode line.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this case:) 

• Malfunction of the data link connector.

• Damaged harness wire.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

03DB187A

CONNECTOR: C-125

DATA LINK 

CONNECTOR

03DB189A

CONNECTOR: C-216

C-216

JUNCTION

BLOCK

03DB172A

CONNECTOR: C-211

C-211

JUNCTION

BLOCK

03DB171A

CONNECTOR: C-29

C-29